Typically, a fan can draw much more current at startup than specified for running at full speed. Maybe that's what happened. Did you try to run the fan with PWM? Typically, fans from ebmpapst St. Georgen are not specified to run with a PWM 24VDC (means they could produce some spikes?). They have seperate models with a PWM signal line.
If it is not designed for PWM, could their be problems from the inductive load causing voltage spikes?
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The crossflow fan has just two cables (+\-) and no pwn control. When I had the transistor dead was after a minute or so testing speeds with the ulticontroll. The crossflow starter at 40-60/255 and at 255 it literally could make the filament fly.
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